Almourol
In relation to the Tagus river , the islet is in the middle of it , a few meters below the rivers confluence with the Zêzere River , in front of the town of Tancos . 
<triplet> Tagus river <subj> Zêzere River <obj> tributary <triplet> Zêzere River <subj> Tagus river <obj> mouth of the watercourse