Thank you for the video alphabet
About the lakes with flower: i don't know any lakes with blooming flowers but if you are really a fan of "flower-watching" you can visit the Piatra Craiului National Park which is located in Brasov county. In this National Park you can see flowers like those in the pictures i attached, they are endemic or rare species for this area.
Also we have a lot of Botanic Gardens like the one in Cluj county or Iasi county, i attached pictures for them too.
Enjoy the pictures!