Munroe Island or Mundro thuruthu is an inland island group located at the confluence of Ashtamudi Lake and the Kallada River, in Kollam district, Kerala, South India. Munroe Island is a hidden pearl in the backwaters which is composed of a cluster of 8 islands. Each of them is separated by small water channels and lakes. Munroe Island is located about 27 km from Kollam and the total area of about 13.4 km. The island, accessible by road, rail and inland water navigation, is about 25 kilometres (16 mi) from Kollam by road, 38 kilometres (24 mi) north from Paravur, 12 kilometres (7.5 mi) west from Kundara and about 25 kilometres (16 mi) from Karunagapally.
The place is named in honour of Resident Colonel John Munroe, of the former princely state of Travancore. He is said to have integrated several backwater regions by digging canals.
In 1795 the British established their supremacy in South India and the princely state of Travancore came under their governance. From 1800 onwards, a Resident was appointed by East India Company as administrative head of Travancore. The first Resident was Colonel Colin Macaulay, followed by Colonel John Munro. During his tenure Munro oversaw the land reclamation efforts in the delta where Kallada River joins Ashtamudi Lake and the reclaimed island was named after him as Munroe Island. The Dutch Church here in Munroe Island is one of the ancient churches in Kerala. It was built by the Dutch in 1878. The red brick church is a blend of Dutch-Kerala architecture on the scenic banks of Lake Ashtamudi.
The island village is a tourism destination where one can see the coir retting process, coir weaving, fishing, prawns feeding, migratory bird watch, narrow canals and waterways, coconut farms on the lake shore, lagoons, mangrove plants and the beautiful tiny islands of Pathupara.
Main attractions of island is the narrow waterways, canal cruise and the famous Kallada Boat Race held here during the 10-day festival of Onam. It offers a unique and tranquil setting, far away from the constant chaos of modern life.