Floating islands of vegetation stood apart from his expectations. Hard to discern from the air, it was unclear to him if this unusual spectacle was due to bogs of what's called Palsa, a lasagna of peat, permafrost and related vegetation come downstream, or algae. Alaska rivers normally frozen, now become ice free months earlier. The high water at the confluence of rivers seemed to struggle to emancipate itself into the sea.
Photos: Sprouse