Ilokanos , and Americans . There are also very small migration from Koreans . GEOGRAPHY Category: Image - :Marikina skyline.jpg|thumb|Skyline of Marikina City, showing the Sierra Madre mountains during dawn. + Waterways in Marikina * Marikina River * Nangka River* Balanti Creek* Sapang Baho Creek * Bangkaan Creek* Concepcion Creek* Park Creek*