The land near to the sea. The term 'coastal' can refer to that land , or to that part of the marine environment that is strongly influenced by land-based processes. Thus, coastal seas are generally shallow and near-shore. The landward and seaward limits of the coastal zone are not consistently defined, neither scientifically nor legally. Thus, coastal waters can either be considered as equivalent to territorial waters , or to the full exclusive economic zone, or to shelf seas, with less than 200 m water depth.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report