The A20 is entirely located in the Dutch province South Holland and connects the N213 road from the Westland municipality with the cities of Rotterdam and Gouda, where it connects to the A12 motorway at the interchange Gouwe.

[1] The section near Rotterdam, between the interchanges with the A4 and A16 motorways, is the northern part of the so-called Ring Rotterdam, the beltway around the city.

Besides, the European route E19 follows the A20 along the 6 kilometers (4 miles) short stretch between interchanges Kleinpolderplein and Terbregseplein, just north of Rotterdam.

The entire route is in South Holland.

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