diff --git a/map_gen/maps/solid_rock.lua b/map_gen/maps/solid_rock.lua
index 6bd5e247..a55ec17a 100644
--- a/map_gen/maps/solid_rock.lua
+++ b/map_gen/maps/solid_rock.lua
@@ -23,7 +23,7 @@ ScenarioInfo.add_map_extra_info([[
 - The beasts on this planet are savage and unrelenting.
 ]])
 
-RS.set_map_gen_settings({MGSP.enemy_very_high, MGSP.tree_none, MGSP.cliff_very_high})
+RS.set_map_gen_settings({MGSP.enemy_very_high, MGSP.tree_none, MGSP.cliff_high})
 
 config.hail_hydra.enabled = true
 
@@ -64,25 +64,21 @@ Event.on_init(
 
 -- Map
 
-local function on_chunk_generated(event)
-    local bd_box = event.area
-    local surface = event.surface
-    if surface ~= RS.get_surface() then
-        return
-    end
-
-    -- remove rocks
-    local ents = surface.find_entities_filtered {area = bd_box, type = 'simple-entity'}
+local function no_rocks(_, _, world, tile)
+    local x, y = world.x, world.y
+    local ents = world.surface.find_entities_filtered {area = {{x, y}, {x + 1, y + 1}}, type = 'simple-entity'}
     for i = 1, #ents do
         ents[i].destroy()
     end
-end
 
-Event.add(defines.events.on_chunk_generated, on_chunk_generated)
+    return tile
+end
 
 local start = b.full_shape
 start = b.change_map_gen_collision_tile(start, 'ground-tile', 'refined-concrete')
 start = b.change_map_gen_collision_hidden_tile(start, 'ground-tile', 'lab-dark-2')
 local map = b.if_else(start, b.full_shape)
 
+map = b.apply_effect(map, no_rocks)
+
 return map
diff --git a/resources/map_gen_settings.lua b/resources/map_gen_settings.lua
index 873f7bda..7fa7337d 100644
--- a/resources/map_gen_settings.lua
+++ b/resources/map_gen_settings.lua
@@ -215,6 +215,14 @@ return {
         cliff_elevation_0 = 10,
         cliff_elevation_interval = 10
     },
+    -- cliffs to high frequency, big size
+    cliff_high = {
+        cliff_settings = {
+            cliff_elevation_0 = 5,
+            cliff_elevation_interval = 5,
+            name = 'cliff'
+        }
+    },
     -- cliffs to very high frequency, very big size
     cliff_very_high = {
         cliff_settings = {