Where may untreated human waste be dumped overboard while on island waters?

Untreated human waste may be dumped overboard in designated areas that comply with marine regulations, usually at least three nautical miles from shore. However, many jurisdictions and international agreements, such as MARPOL Annex IV, prohibit the discharge of untreated sewage in sensitive marine environments or near populated areas. It's essential for vessels to follow local laws and guidelines to protect marine ecosystems and public health. Always check current regulations specific to the region before discharging waste.