Wikipedia
Ostabat-Asme , Hostavalem in the Middle Ages, is a commune in the Pyrénées-Atlantiques department, formerly located in the region described for many centuries as Lower Navarre, in south-western France. It was the meeting point of 4 European ways to Santiago de Compostela, 3 of them joining together there, namely Paris - Tours - Poitiers - Dax, from Center - Europe linking to Limoges, from Genoa and Lyon through Moissac, the fourth one the Toulouse way, linking Central Italy with the Languedoc region, the Toulouse region and linking though the Béarn region, via Lescar- Oloron to Somport, Spain, and the Spanish Pyrénées.
The 3 linked Saint James ways proceed from there, through Larceveau-Arros-Cibits, Ainhice-Mongelos, Gamarthe, Lacarre and Iriberry towards Saint-Jean-le-Vieux, (43º09'57"N, 1º11'32" W), a.k.a. Donazaharre to Saint-Jean-Pied-de-Port, and to the Spanish Frontier, Roncesvalles, (42º59'23"N, 1º20'4"W) .
It is and it was thus located in the former province of Lower Navarre.