Gatika(basque) is inland in basque country. you can see if VT has tips about these cities above in destinations. or go to the tourist office in Euskadi Basque country here
Zumaja is Spanish, been basque it is written Zumaia, here is again the tourist office. this is beautiful coastal area.
you have each city link above sites, the bus is available from Bilbao on the A 316 bilbao mungia and then change bus on the A3531 to Gatika, all is here
go left column to municipio de Bizkaia in both DESDE and HASTA, go down the selection of cities until you hit the ones you are going, highlighted them and then hit CONSULTA
When I am in the area I go by car, but the above should help you
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