diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9475062..6d27aea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@
   individually. `border.width` is now a short-hand for setting all
   four borders to the same value
   (https://codeberg.org/dnkl/yambar/issues/77).
+* river: `per-output: false|true`.
 
 
 ### Changed
diff --git a/bar/backend.h b/bar/backend.h
index d365da6..47fae95 100644
--- a/bar/backend.h
+++ b/bar/backend.h
@@ -14,4 +14,5 @@ struct backend {
     void (*commit)(const struct bar *bar);
     void (*refresh)(const struct bar *bar);
     void (*set_cursor)(struct bar *bar, const char *cursor);
+    const char *(*output_name)(const struct bar *bar);
 };
diff --git a/bar/bar.c b/bar/bar.c
index c7b1ea5..9d1b0cc 100644
--- a/bar/bar.c
+++ b/bar/bar.c
@@ -162,6 +162,13 @@ set_cursor(struct bar *bar, const char *cursor)
     b->backend.iface->set_cursor(bar, cursor);
 }
 
+static const char *
+output_name(const struct bar *bar)
+{
+    const struct private *b = bar->private;
+    return b->backend.iface->output_name(bar);
+}
+
 static void
 on_mouse(struct bar *_bar, enum mouse_event event, enum mouse_button btn,
          int x, int y)
@@ -456,6 +463,7 @@ bar_new(const struct bar_config *config)
     bar->destroy = &destroy;
     bar->refresh = &refresh;
     bar->set_cursor = &set_cursor;
+    bar->output_name = &output_name;
 
     for (size_t i = 0; i < priv->left.count; i++)
         priv->left.mods[i]->bar = bar;
diff --git a/bar/bar.h b/bar/bar.h
index 5d154dd..45fb328 100644
--- a/bar/bar.h
+++ b/bar/bar.h
@@ -12,6 +12,8 @@ struct bar {
 
     void (*refresh)(const struct bar *bar);
     void (*set_cursor)(struct bar *bar, const char *cursor);
+
+    const char *(*output_name)(const struct bar *bar);
 };
 
 enum bar_location { BAR_TOP, BAR_BOTTOM };
diff --git a/bar/wayland.c b/bar/wayland.c
index ef62025..cb10eae 100644
--- a/bar/wayland.c
+++ b/bar/wayland.c
@@ -1308,6 +1308,15 @@ set_cursor(struct bar *_bar, const char *cursor)
     update_cursor_surface(backend, seat);
 }
 
+static const char *
+output_name(const struct bar *_bar)
+{
+    const struct private *bar = _bar->private;
+    const struct wayland_backend *backend = bar->backend.data;
+
+    return backend->monitor != NULL ? backend->monitor->name : NULL;
+}
+
 const struct backend wayland_backend_iface = {
     .setup = &setup,
     .cleanup = &cleanup,
@@ -1315,4 +1324,5 @@ const struct backend wayland_backend_iface = {
     .commit = &commit,
     .refresh = &refresh,
     .set_cursor = &set_cursor,
+    .output_name = &output_name,
 };
diff --git a/bar/xcb.c b/bar/xcb.c
index 9c452da..4b0e7c1 100644
--- a/bar/xcb.c
+++ b/bar/xcb.c
@@ -462,6 +462,13 @@ set_cursor(struct bar *_bar, const char *cursor)
         backend->conn, backend->win, XCB_CW_CURSOR, &backend->cursor);
 }
 
+static const char *
+output_name(const struct bar *_bar)
+{
+    /* Not implemented */
+    return NULL;
+}
+
 const struct backend xcb_backend_iface = {
     .setup = &setup,
     .cleanup = &cleanup,
@@ -469,4 +476,5 @@ const struct backend xcb_backend_iface = {
     .commit = &commit,
     .refresh = &refresh,
     .set_cursor = &set_cursor,
+    .output_name = &output_name,
 };
diff --git a/config-verify.c b/config-verify.c
index 7c4f365..5d4089a 100644
--- a/config-verify.c
+++ b/config-verify.c
@@ -50,6 +50,17 @@ conf_verify_int(keychain_t *chain, const struct yml_node *node)
     return false;
 }
 
+bool
+conf_verify_bool(keychain_t *chain, const struct yml_node *node)
+{
+    if (yml_value_is_bool(node))
+        return true;
+
+    LOG_ERR("%s: value is not a boolean: '%s'",
+            conf_err_prefix(chain, node), yml_value_as_string(node));
+    return false;
+}
+
 bool
 conf_verify_list(keychain_t *chain, const struct yml_node *node,
                  bool (*verify)(keychain_t *chain, const struct yml_node *node))
diff --git a/config-verify.h b/config-verify.h
index dccaf5f..5afe3f6 100644
--- a/config-verify.h
+++ b/config-verify.h
@@ -32,6 +32,7 @@ const char *conf_err_prefix(
 
 bool conf_verify_string(keychain_t *chain, const struct yml_node *node);
 bool conf_verify_int(keychain_t *chain, const struct yml_node *node);
+bool conf_verify_bool(keychain_t *chain, const struct yml_node *node);
 
 bool conf_verify_enum(keychain_t *chain, const struct yml_node *node,
                       const char *values[], size_t count);
diff --git a/doc/yambar-modules-river.5.scd b/doc/yambar-modules-river.5.scd
index 46607a2..570e8a5 100644
--- a/doc/yambar-modules-river.5.scd
+++ b/doc/yambar-modules-river.5.scd
@@ -12,8 +12,8 @@ about the river tags.
 It has an interface similar to the i3/sway module.
 
 The configuration for the river module specifies one _title_ particle,
-which will be instantiated with tags representing the currently active
-seat and the currently focused view's title.
+which will be instantiated once for each seat, with tags representing
+the seats' name and the title of the seats' currently focused view.
 
 It also specifies a _content_ template particle, which is instantiated
 once for all 32 river tags. This means you probably want to use a
@@ -41,10 +41,10 @@ once for all 32 river tags. This means you probably want to use a
 :  Set to *focused* if _focused_ is true, *unfocused* if _visible_ is true, but _focused_ is false, or *invisible* if the river tag is not visible on any monitors.
 |  seat
 :  string
-:  The name of the currently active seat (*title* particle only, see CONFIGURATION)
+:  The name of the seat (*title* particle only, see CONFIGURATION)
 |  title
 :  string
-:  The focused view's title (*title* particle only, see CONFIGURATION)
+:  The seat's focused view's title (*title* particle only, see CONFIGURATION)
 
 # CONFIGURATION
 
@@ -60,6 +60,12 @@ once for all 32 river tags. This means you probably want to use a
 :  particle
 :  yes
 :  Template particle that will be instantiated once for all of the 32 river tags.
+|  per-output
+:  bool
+:  no
+:  When set to false (the default), tags reflect the union of all
+   outputs. When set to true, tags reflect river tags and seats for
+   the output yambar is on only.
 
 # EXAMPLES
 
diff --git a/modules/river.c b/modules/river.c
index 0cdab38..9b494f3 100644
--- a/modules/river.c
+++ b/modules/river.c
@@ -48,6 +48,7 @@ struct private {
     struct zriver_status_manager_v1 *status_manager;
     struct particle *template;
     struct particle *title;
+    bool per_output;
 
     bool is_starting_up;
     tll(struct output) outputs;
@@ -76,6 +77,8 @@ content(struct module *mod)
 {
     const struct private *m = mod->private;
 
+    const char *output_bar_is_on = mod->bar->output_name(mod->bar);
+
     mtx_lock(&m->mod->lock);
 
     uint32_t output_focused = 0;
@@ -85,6 +88,13 @@ content(struct module *mod)
     tll_foreach(m->outputs, it) {
         const struct output *output = &it->item;
 
+        if (m->per_output &&
+            output_bar_is_on != NULL && output->name != NULL &&
+            strcmp(output->name, output_bar_is_on) != 0)
+        {
+            continue;
+        }
+
         output_focused |= output->focused;
         occupied |= output->occupied;
 
@@ -348,7 +358,6 @@ unfocused_output(void *data, struct zriver_seat_status_v1 *zriver_seat_status_v1
 
     mtx_lock(&mod->lock);
     {
-
         struct output *output = NULL;
         tll_foreach(m->outputs, it) {
             if (it->item.wl_output == wl_output) {
@@ -382,13 +391,21 @@ focused_view(void *data, struct zriver_seat_status_v1 *zriver_seat_status_v1,
 
     LOG_DBG("seat: %s: focused view: %s", seat->name, title);
 
-    mtx_lock(&mod->lock);
+    const char *output_bar_is_on = mod->bar->output_name(mod->bar);
+
+    if (!seat->m->per_output ||
+        (output_bar_is_on != NULL &&
+         seat->output != NULL && seat->output->name != NULL &&
+         strcmp(output_bar_is_on, seat->output->name) == 0))
     {
-        free(seat->title);
-        seat->title = title != NULL ? strdup(title) : NULL;
+        mtx_lock(&mod->lock);
+        {
+            free(seat->title);
+            seat->title = title != NULL ? strdup(title) : NULL;
+        }
+        mtx_unlock(&mod->lock);
+        mod->bar->refresh(mod->bar);
     }
-    mtx_unlock(&mod->lock);
-    mod->bar->refresh(mod->bar);
 }
 
 static const struct zriver_seat_status_v1_listener river_seat_status_listener = {
@@ -646,11 +663,12 @@ out:
 }
 
 static struct module *
-river_new(struct particle *template, struct particle *title)
+river_new(struct particle *template, struct particle *title, bool per_output)
 {
     struct private *m = calloc(1, sizeof(*m));
     m->template = template;
     m->title = title;
+    m->per_output = per_output;
     m->is_starting_up = true;
 
     struct module *mod = module_common_new();
@@ -668,9 +686,12 @@ from_conf(const struct yml_node *node, struct conf_inherit inherited)
 {
     const struct yml_node *c = yml_get_value(node, "content");
     const struct yml_node *title = yml_get_value(node, "title");
+    const struct yml_node *per_output = yml_get_value(node, "per-output");
+
     return river_new(
         conf_to_particle(c, inherited),
-        title != NULL ? conf_to_particle(title, inherited) : NULL);
+        title != NULL ? conf_to_particle(title, inherited) : NULL,
+        per_output != NULL ? yml_value_as_bool(per_output) : false);
 }
 
 static bool
@@ -678,6 +699,7 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
         {"title", false, &conf_verify_particle},
+        {"per-output", false, &conf_verify_bool},
         MODULE_COMMON_ATTRS,
     };