What territory did Charlemagne use as a base south of the Pyrenees to launch crusades to reconquer Spain?

Name: What territory did Charlemagne use as a base south of the Pyrenees to launch crusades to reconquer Spain?
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Charlemagne used the Spanish March, a territorial buffer zone between the Frankish Kingdom and Muslim-controlled Spain, as a base for his campaigns to reconquer Spain. This area was fortified with numerous castles and served as a strategic point of defense and attack for the Franks.

What Territory Did Charlemagne Use as a Base South of the Pyrenees