Waterloo is an area of the Metropolitan Borough of Sefton, in Merseyside, England. It is part of the Liverpool City Region. Together with Seaforth, the two localities make up the borough's Church ward. The area is bordered by Crosby to the north, Seaforth to the south, the Rimrose Valley country park to the east, and to the west Crosby Beach and Crosby Coastal …Waterloo is an area of the Metropolitan Borough of Sefton, in Merseyside, England. It is part of the Liverpool City Region. Together with Seaforth, the two localities make up the borough's Church ward. The area is bordered by Crosby to the north, Seaforth to the south, the Rimrose Valley country park to the east, and to the west Crosby Beach and Crosby Coastal Park.