GEOGRAPICAL AND RESOURCE ENDOWMENT
It lies at the northern part of Pinamalayan. It is bounded on the east by Tablas Strait on the west by barangay Sta. Isabel, on the south by barangay Wawa and on the north by barangay Guinhawa.
It is 3 kilometers away from the poblacion, and 70 kilometers from the Provincial Capitol.
The barangay has seven sitios namely Zone I, Zone II, Zone III, Zone IV, Zone V, Zone VI and Zone VII.
Barangay Lumambayan is 80% plain and 20% coastal. It has a total land area of 226.4656 sq. km.