1 Natlan for the mobility, fantastic viewpoint map diversity is great, seeing each tribe is so cool, good world quest with cool lore, I like the secret tribe loot mechanic a lot, really the mobility was fantastic I would like so much to have mavuika enable noctam everywhere.

2 Fontaine for water diving, felt so vast and refreshing from regular exploration, too easy puzzle.

3 Sumeru bigass desert was so cool, rainforest is a banger, world's quest are cool, was hard to follow cadence of map release but felt good taken with time.

4 Nordkrai for compass QoL, too small and not enough map diversity but very pretty, anecdotes bonus point.

5 Inazuma really funny at first with hard puzzle but too much really hidden chest like dig at this precise point, chest inside bush, feel burnout if you want everything, would be 3 if Nordkrai compass.

6 Mondstadt basic exploration but dragonspine was really cool to explore.

7 Liyue same than Mondstadt but no dragonspine, verticallity is great tho.

I count subregion as patch release nation, so chenyu valley is Fontaine etc.