Doing a quick search on other tags on the site, it seems that "place" tags are pretty sparse. I see tags being used for bodies of water like oceans, and I see some land masses like continents and "greenland". If we introduce a tag for the Himalayas, it would seem that many places could also be added (e.g. Sahara, Hawaii, Australia, Africa, Andes, Alps, etc.), so it could potentially be a slippery slope. Personally I don't have a problem with adding more tags, but many users think they should be cleaned up. I think adding the Himalayas would be fine. We just have to be sure we are adding geographic places, not political places. For instance, Mediterranean is a current tag, but "Germany" was deleted. I agree with this idea and think we should delete tags like "California" but keep tags like "Greenland". Here is a post that discusses this more: Should we clean up the tags on this site?