<p><b>@Nakaner</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2390#discussion_r334802337">app/views/microcosms/_form.html.erb</a>:</p>
<pre style='color:#555'>> +    <%= form.text_field :location, id: :microcosm_location %>
+  </div>
+
+  <div class="field">
+    <%= form.label :lat %>
+    <%= form.text_field :lat, id: :microcosm_lat %> (decimal)
+  </div>
+
+  <div class="field">
+    <%= form.label :lon %>
+    <%= form.text_field :lon, id: :microcosm_lon %> (decimal)
+  </div>
+
+  <p>
+    To get a bounding box use Geofabrik's <a href="http://tools.geofabrik.de/calc/#type=geofabrik_standard&bbox=-120.848658,31.674368,-79.375023,49.413863&tab=1&proj=EPSG:4326&places=2">Tile Calculator</a> tool.
+  </p>
</pre>
<p>You might use <a href="https://github.com/kajic/leaflet-locationfilter">https://github.com/kajic/leaflet-locationfilter</a> to allow users select the bounding box. The Leaflet plugin is used at <a href="https://tyrasd.github.io/osm-qa-feeds/" rel="nofollow">https://tyrasd.github.io/osm-qa-feeds/</a> (you have to search for a location first).</p>

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