Another new study has sea levels 1.8 -2.3 m higher than today from 8600 to 6100 years ago. Sea levels were higher because less water was locked up on land as ice throughout the much warmer Mid-Holocene..
https://www.researchgate.net/publication/391154596_Holocene_sea-level_changes_and_the_influence_of_storms_on_beach_ridge_formation_in_the_Lower_Gulf_of_Thailand
