Screenshot coming soon.
Amphibious is a gear perk that makes you faster while moving through shallow water. Yara has a lot of rivers, beaches and swamps, so it comes up more than you might think.
Wading through shallow water normally slows you down. With Amphibious you keep up a better pace along coastlines and in marshy ground.
Wear one of the gear pieces that carry it: Swashbuckler's Boots. Each piece only takes one body slot, so plan around the other perks you want.
A niche perk. It is pleasant on coastal operations, but a combat or stealth perk usually does more for the boot slot.