What was the largest oil spill by a tanker? I thought it was Castillo de Bellver, but when I typed this into the internet, it stated that it was Amoco Cadiz. Can anyone help?

http://en.wikipedia.org/wiki/Oil_spill#Largest_oil_spills

To determine the largest oil spill by a tanker, you can consult reputable sources such as government agencies, environmental organizations, or official records. In this case, the information you found on Wikipedia is a reliable source. The Amoco Cadiz oil spill is considered the largest oil spill from a tanker.

If you're still uncertain, you can cross-reference this information with other sources. This can include books, scientific articles, or news reports that cover the subject matter. By examining multiple sources and comparing information, you can get a clearer understanding of the largest oil spill by a tanker.