Terrain & water height issue. Try these values in your VeitenamSEA_Data.ini:
[TerrainMesh]
TextureThreshold=0.80
LowDetailMeshThreshold=0.50
MedDetailMeshThreshold=0.30
TileToHeightGridRatio=4
RenderMeshVertexCount=16384
RenderMeshIndexCount=16384
SolidObjectVertexCount=16384
SolidObjectIndexCount=16384
AlphaObjectVertexCount=16384
AlphaObjectIndexCount=16384
[HeightField]
DetailScale=1.0
DetailFrequency=1.0
MaxHeight=1000
MinHeight=-0.5
[WaterTextureMaterial]
UseEffectShader=TRUE
EffectShaderName=WATEREFFECT.FX
DepthBufferCheck=TRUE
DepthBufferWrite=FALSE
RenderedInOrder=TRUE
AlphaTestEnabled=TRUE
CullMode=CLOCKWISE
LightEnabled=TRUE
SpecularEnabled=TRUE
EmissiveEnabled=TRUE
FogEnabled=TRUE
AmbientColor=1.000000,1.000000,1.000000,1.000000
DiffuseColor=1.000000,1.000000,1.000000,1.000000
SpecularColor=0.500000,0.500000,0.500000,0.500000
SpecularPower=50.000000
Tansparency=25.000
Reflectivity=50.00000
ZBufferOffset=2.000000
BlendOp=BLEND_SRC_ALPHA
NumTextureStages=2
TextureStage[01].TextureName=
TextureStage[01].MipMap=TRUE
TextureStage[01].FilterEnabled=TRUE
TextureStage[01].StageColorOp=TEXTURE_MODULATE_DIFFUSE
TextureStage[01].StageAlphaOp=TEXTURE
TextureStage[02].TextureName=
TextureStage[02].MipMap=TRUE
TextureStage[02].FilterEnabled=TRUE
TextureStage[02].ReflectionMapping=TRUE
TextureStage[02].StageColorOp=TEXTURE_BLEND_TEXTURE_ALPHA
TextureStage[02].StageAlphaOp=DIFFUSE