Unlike a Twitter Geo-Search, which is based on a specific geo code, Instagram’s location search uses:

Instagram's location search relies on a curated list of approved, global locations that users can tag in their posts. This allows for consistent and recognizable location data across the platform. Unlike Twitter's Geo-Search, which can pinpoint locations using specific geo-codes (like a radius around a latitude/longitude point), Instagram's system is based on these predefined places. An image match of a location landmark is not a primary search mechanism; while images might help identify a location, the search function itself uses tagged data. Post office delivery codes are too granular and geographically limited for Instagram's global reach. Latitude and longitude markers are the underlying data for many geo-coding systems but are not directly used by Instagram's user-facing location search, which abstracts this into recognizable place names.