Alaskan Multiple Rainbows - Allen Roberts captured this scene at ~10 in the evening. He was at Tikchik Lodge some 300 miles west of Anchorage. The key to the 7+ bows is Allen's location between two lakes. A lake behind the camera (with some help also from the foreground lake) reflected the sun upwards to produce two extra skywards bows. The foreground lake made 3-4 more bows in the water. iPhone image in panorama mode. ©Allen Roberts, shown with permission
The two lakes reflect sunlight upwards to make an extra sun below the horizon. The two suns each produced their own primary and secondary rainbow.
Atmospheric
Optics
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The watery bows are not reflections in the usual sense. Rainbows are not real and so cannot reflect.

Instead, a different set of raindrops have their rainbow forming rays reflected by the foreground lake.

The 'reflected - reflection bow' just visible at lower right requires two water reflections. Likely one from each lake!