It is correct in that it was the only SWISS colony, but there were hundreds of EVANGELICAL colonies. The Swiss, many of whom had roots or relatives from southern Germany, inter-married with the other German colonists. For example, my maternal grandmother's family came to Zuerichtal from Switzerland, but had roots in Wuerttemberg prior to that. She married a Guenthner, just as some of her ancestors before her had done. the Guenthner family was from Wuerttemberg. Both families settled in Crimea, though the Guenthners were in the German Evangelical (Lutheran) villages.