Which preposition to use with matas

in Occurrences 1%

These isolated clumps or groves, called matas in the provincial idiom, form the landmarks of the Venezuelan Plains; and in the neighborhood of each we shall find the hato or dwelling of a Llanero.

on Occurrences 1%

On a table lay a hastily sketched map showing the position of the fortified works at Molino del Rey, with the Casa Mata on one side and the castle of Chapultepec on the other.

Which preposition to use with  matas