This is not a spoiler, this is the act 3 map, with EVERY map object on it.
There aren't random collectibles to find, obscure quests to run into, nothing. There are 8 things, a home base, and player icon (that's the one by the cursor/waypoint). All of the other icons aren't ranodm bullshit, they're bespoke missions.
The lit up part represents the entirety of the explorable 'world' in the game in act 3, and act 2 isn't any bigger. Act 1 and 4 don'[t have them.
All of the OPs fears are EXTREMELY misplaced. Like, donkey kong country takes longer to get across the map in than this game.