Mallig, officially the Municipality of Mallig, is a landlocked 4th class municipality in the province of Isabela, Philippines. The municipality h…Mallig, officially the Municipality of Mallig, is a landlocked 4th class municipality in the province of Isabela, Philippines. The municipality has a land area of 133.40 square kilometers or 51.51 square miles which constitutes 1.07% of Isabela's total area. Its population as determined by the 2020 Census was 32,208.