וַיֵּלְכ֣וּ הַמַּ֔יִם סָבִ֖יב לַמִּזְבֵּ֑חַ וְגַ֥ם אֶת־הַתְּעָלָ֖ה מִלֵּא־מָֽיִם׃
And the water ran round about the altar; and he filled the trench also with water.
Read kabbalistic (mystical) interpretation of I Kings 18:35: and classical mystical sources.