Hazards are parts of the landscape that could kill you. Some of these, such as spikes, could also be considered obstacles as you have to slide around them to navigate the map. Other's, such as ponds, are not necessarily obstacles as you can slide over them quickly as long as you don't stop.

Ponds Lava Pools Spikes Unfenced Edges
Small pond
Medium pond
IMG 3950
IMG 3943