Read about how Raman effect was discovered in Mediterranean Sea water.

https://www.google.com/maps/place/Mediterranean+Sea/@29.6701854,-28.1180304,14181073m/data=!3m1!1e3!4m10!1m2!2m1!1smediterranean+sea+google!3m6!1s0x131421b81c473c9f:0x2e93598afeccf840!8m2!3d34.5531284!4d18.0480105!15sChhtZWRpdGVycmFuZWFuIHNlYSBnb29nbGUiA4gBAZIBA3NlYeABAA!16zL20vMDRzd3g?entry=ttu&g_ep=EgoyMDI0MDgyOC4wIKXMDSoASAFQAw%3D%3D