Speed
When you use the Stride action, you move a number of feet equal to your Speed. Whenever a rule mentions your Speed without specifying a type, it's referring to your land Speed.
Hover: Some creatures, such as barathus, have a land Speed that represents how fast they can move while hovering within 5 feet of a solid surface. Hovering creatures don't count as flying but might be able to avoid certain types of difficult or hazardous terrain, at the GM's discretion.