I really wonder what this is:
I find it near pound in Czech Republic (Central Europe). It's 2 inches long, AP. half wide. It was quite fast.
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It is a Coleopteran insect (Beetle order) in the Ground beetle (Carabidae) family. Based on the elytra (protective wings) and the dark first antennal segment, it looks like Carabus granulatus. C. cancellatus is very similar, but has reddish first antennal segments. I don't think there are any other similar species in the Czech republic, but don't know the fauna there well. Overall, Carabus has many species and several are native to Eurasia and can be a size of 2 inches.
Sorry for the late answer. I only bumped into this photo today. And sorry, guys. It is neither granulatus or cancellatus. This is a Carabus ullrichi. Without a single doubt. granulatus is narrow and elongated. Primary and secondary keels with cancellatus are more narrow. This one is convex, plump with very distinct keels. Carabus ullrichi. For sure.