the second pic only shows kind of stretched/ distorted for me

in this location Typha would be typical, some bulrush, but I think the overall habitus does not really fit

in Europe the native species are T latifolia or T angustifolia would be typical, they have very strong rhizomes and their leaves are filled with a kind of pith, you can feel it when you squish a spot

Acorus calamus would fit for the spot, it has a nice scent when crushed and a more shiny surface

could you repost the second pic and perhaps more details if you have them?