--- a/data/json/overmap/map_extras.json
+++ b/data/json/overmap/map_extras.json
@@ -145,8 +145,8 @@
   {
     "id": "mx_portal",
     "type": "map_extra",
-    "name": { "str": "Portal" },
-    "description": "Portal is here.",
+    "name": { "str": "Shimmering Portal" },
+    "description": "Shimmering Portal is here.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_portal" },
     "min_max_zlevel": [ -5, 5 ],
     "sym": "P",
@@ -156,7 +156,7 @@
   {
     "id": "mx_portal_in",
     "type": "map_extra",
-    "name": { "str": "Portal In" },
+    "name": { "str": "Tear in Reality" },
     "description": "Another portal is here.",
     "generator": { "generator_method": "map_extra_function", "generator_id": "mx_portal_in" },
     "min_max_zlevel": [ -5, 5 ],
@@ -238,7 +238,7 @@
     "id": "mx_spider",
     "type": "map_extra",
     "name": { "str": "Spiders" },
-    "description": "This area is covered with webs.  Probably spiders are nearby",
+    "description": "This area is covered with webs.  Probably spiders are nearby.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_spider" },
     "min_max_zlevel": [ -2, 0 ],
     "sym": "S",
@@ -352,10 +352,13 @@
   {
     "id": "mx_trees",
     "type": "map_extra",
-    "name": { "str": "Stand of trees" },
+    "name": { "str": "Copse of trees" },
     "description": "A copse of trees.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_trees_map" },
-    "min_max_zlevel": [ 0, 0 ]
+    "min_max_zlevel": [ 0, 0 ],
+    "sym": "t",
+    "color": "light_green",
+    "autonote": true
   },
   {
     "id": "mx_trees2",
@@ -384,7 +387,10 @@
     "name": { "str": "Tall grass" },
     "description": "A meadow of tall grass.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_grass_map" },
-    "min_max_zlevel": [ 0, 0 ]
+    "min_max_zlevel": [ 0, 0 ],
+    "sym": "g",
+    "color": "light_green",
+    "autonote": true
   },
   {
     "id": "mx_grass2",
@@ -501,7 +507,10 @@
     "description": "Some looters gathering everything not nailed down.",
     "generator": { "generator_method": "map_extra_function", "generator_id": "mx_looters" },
     "min_max_zlevel": [ -2, 0 ],
-    "flags": [ "MAN_MADE" ]
+    "flags": [ "MAN_MADE" ],
+    "sym": "L",
+    "color": "red",
+    "autonote": true
   },
   {
     "id": "mx_corpses",
@@ -510,7 +519,10 @@
     "description": "Some unfortunates from the billions lost in the Cataclysm.",
     "generator": { "generator_method": "map_extra_function", "generator_id": "mx_corpses" },
     "min_max_zlevel": [ -5, 0 ],
-    "flags": [ "MAN_MADE" ]
+    "flags": [ "MAN_MADE" ],
+    "sym": "c",
+    "color": "light_red",
+    "autonote": true
   },
   {
     "id": "mx_nest_wasp",
@@ -541,7 +553,10 @@
     "description": "A prison bus.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_prison_bus" },
     "min_max_zlevel": [ 0, 0 ],
-    "flags": [ "MAN_MADE" ]
+    "flags": [ "MAN_MADE" ],
+    "sym": "P",
+    "color": "blue",
+    "autonote": true
   },
   {
     "id": "mx_mass_grave",
@@ -558,11 +573,14 @@
   {
     "id": "mx_grave",
     "type": "map_extra",
-    "name": { "str": "Grave" },
-    "description": "A grave.",
+    "name": { "str": "Solitary Grave" },
+    "description": "A solitary grave.",
     "generator": { "generator_method": "update_mapgen", "generator_id": "mx_grave" },
     "min_max_zlevel": [ 0, 0 ],
-    "flags": [ "MAN_MADE" ]
+    "flags": [ "MAN_MADE" ],
+    "sym": "c",
+    "color": "white",
+    "autonote": true
   },
   {
     "id": "mx_city_trap",