In 2009, responding to a request from the Government of Sri Lanka (GOSL), the Asian Development Bank (ADB) initiated a Technical Assistance (TA) project titled “Strengthening Capacity for Climate Change Adaptation”. The TA was implemented through the Climate Change Secretariat (CCS) of the Ministry of Environment. The primary goal of the TA was to support the GOSL initiative to adapt key sectors in the economy and safeguard Sri Lanka’s national interest against climate change threats. Vulnerability mapping was one of the primary outputs of the TA and mapping was carried out for the five key sector groupings considered critical for national development: Urban development, human settlements and economic infrastructure; Water; Agriculture and fisheries; Health; Biodiversity and ecosystem services. The purpose of this data book is to make the data collected and processed for this exercise readily available to all interested. It is also expected that such data availability will encourage interested parties to refine the findings and methodology further, and also to ensure that there is a base line for future comparisons.