Chapada (original name in this case)
Explanation: I would recommend to keep the original form because it refers to the name of the place.
... Other States in Brazil (27) ... Chapada da Lagoa; Chapada da Sindá; Chapada da
Vereda; Chapada de São Francisco; Chapada de São Miguel; Chapada do Acude ...
piaui.takingitglobal.org/ - 249k
... Other City Sites in Piaui, Brazil (3237) ... Chapada da Vereda; Chapada de
São Francisco; Chapada de São Miguel; Chapada do Acude; Chapada do Barrocão ...
teresina.piaui.takingitglobal.org/
|  Claudio Mazotti Brazil Local time: 04:48 Native speaker of: Portuguese PRO pts in category: 4
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