What is a 'Put Option' A put option is an option contract giving the owner the right, but not the obligation, to sell a specified amount of an underlying security at a specified price within a specified time. This is the opposite of a call option, which gives the holder the right to buy shares. BREAKING DOWN 'Put Option'
High Altitude Sickness and Everest Base Camp. One of the major challenges facing trekkers heading to Everest Base Camp or any other high elevation trek in the Himalayas is dealing with the potential threat of High Altitude Sickness. The primary cause of High Altitude Sickness is a decrease in the amount of available oxygen with altitude.
Camping is allowed along most of the trail, more than 100 ft (30 m) from water, but level ground that meets that description is extremely limited, so most backpackers congregate in two camps. Outpost Camp, the lower of the two camps, is 3.8 mi (6.1 km) by trail from Whitney Portal, at 10,365 ft (3,159 m).