Tags: Road Tunnel.

The Negrón Tunnel (Spanish: Túnel del Negrón) is an automotive tunnel which connects the provinces of Asturias and León in Northern Spain. The tunnel is 4144 metres (13596 ft) long and reaches a height of 1229 metres (4032 ft).The tunnel is in the toll highway AP-66 which is part of the Autovía A-66 one of the longest highways in Spain.

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