Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Abaia (Melanesia)
According to Melanesian mythology the Abaia is a type of large eel which dwells at the bottom of freshwater lakes in the Fiji, Solomon and Vanuatu Islands. The Abaia is said to consider all creatures in the lake its children and protects them furiously against anyone who would harm or disturb them.
It is said that those who are foolish enough to try to catch the fish from a lake containing the Abaia are immediately overwhelmed by a large wave caused by the thrashing of the Abaia's powerful tail. Another version of the legend states that if someone were to harm a creature living in the Abaia's home, the Abaia would cause a great rain storm flooding the land and drowning those who had caused the harm.