The source of Costa Beck is Keld Head Spring to the west of Pickering. It is a tributary of the River Rye which joins the River Derwent, eventually flowing into the River Ouse at Barmby on the Marsh. Costa Beck was used for ship transport by mills as early as 1200. It is an ancient Anglo Saxon name.
The waters of Costa Beck are noted for their crystal-clarity, and fly fishing is popular and available by arrangement, usually free of charge. Trout, dace, grayling, salmon, and pike can all be found in Costa Beck and kingfishers can be seen flying above. Today the river lies adjacent to Flamingo Land Theme Park and Zoo, where visitors occasionally come from to fish.
- "The Derwent Catchment Abstraction Management Strategy" (PDF). Environment Agency. March 2006. Retrieved 2008-03-25.