Naval fighting at Himalayan altitude

What is the highest-elevation naval battle on record?

Boat confrontations on Pangong Lake at about 14,000 feet are a candidate, depending on whether those encounters count as naval battles.

Pangong Lake, in the India-Tibet border region, is proposed as a candidate at about 14,000 feet above sea level. The encounters involve boats and disputed definitions of a battle. Other fighting at slightly lower elevations is described as more clearly active combat. Violence around the India-China border includes clashes despite restrictions on firearms. No definitive ranking of all high-altitude naval engagements is established.