This is Dragon Lake, a body of very cold water near the city of Bratsk. It’s a reservoir, like Arizona’s Lake Powell, formed by the damming of a river, in this case, the Angara River. Over time, all those intricate white crackles will soften and fade as the lake makes itself comfortable in its banks. But for now, it’s still new and electric.
Image courtesy of USGS National Center for EROS and NASA Landsat Project Science Office, from the wonderful Our Earth As Art gallery.