Ambasa had been the former name of Brangay San Roque which is the western most barangay of San Nicolas from the town proper . It is bounded on the west by Barangay Legaspi of Tayug, Pangasinan; on the west of barangay Nagkaysa , on the south by Brgy. Siblot ; and on the north by Barangay Sobol. Ambasa , which in the local dialect means “predominantly wet’ really never runs off water . In fact there are still p[laces like in Sitio Allola

Summary:

Brgy.                            : San Roque

Population                    : 2,089( 1995 census)

No. of Households         : 390 ( 1995 census)

Land Area                     : 390 ( 1995 census)

Distance from Municipal hall ; 2.5 kms.

Facilities                       : Brgy.Hall / Day Care center/Basketball Court( Cemented)

Road Condition              : Cemented /Gravelled

Public Utility vehicle       : Tricycle

Sources of Potable Water : Deep Well/Shallow well/Spring developed

Mineral Resources         : Spring Water 

School                          :Elementary

Tourist Attraction           :

Farm product                 : Palay/Corn/Gabi