An ea (river) is a flow of water over land, from the highest ords into the sea or some other low ord (for byspel, the Okavango ea in south-western Highsun ends inland). The longest ea on Earth is either the Amazon ea or the Nile ea, hinging on how they are meten. The longest in England is the Severn ea.

Eas are fed by water from elsewhere, such as a mere, brook, spring, or a deal of smaller streams known as headwaters and the sundering of which ea water flows to is known as a watershed.

Community content is available under CC-BY-SA unless otherwise noted.