void GenerateRiver()
    {
        // find start and end
        // int randomX = (int)Random.Range(0, createTilesOnX-1);
        // int randomZ = (int)Random.Range(0, createTilesOnZ-1);
        // randomPos = ((int)Random.Range(0, createTilesOnX-1))* (createTilesOnZ -1) + ((int)Random.Range(0, createTilesOnZ - 1));
        Debug.Log("River Init");
        int startEdge = (int)Random.Range(0, 3);
        int endEdge = 3 - ((int)Random.Range(0, 3));

        int startPos = findRandomEdgePos(startEdge);
        int startZ = startPos % (yTiles - 1);
        int startX = (startPos - startZ) / ((yTiles - 1));

        int endPos = findRandomEdgePos(endEdge);
        int endZ = endPos % (yTiles - 1);
        int endX = (endPos - startZ) / ((yTiles - 1));

        int curPos = startPos;
        int curZ = startZ;
        int curX = startX;

        int distZ = startZ - endZ;
        int distX = startX - endX;
        Debug.Log("Random End");
        while (curPos != endPos)
        {
            Debug.Log("ich bin am leben");
            int tempCurZ = curZ;
            int tempCurX = curX;
            //Decide wheter to move on X or Z
            if (Random.Range(0, 1) > .5)
            {
                // move Z
                if (distZ > 0)
                    tempCurZ--;
                else
                    tempCurZ++;
            }
            else
            {
                // move Y
                if (distX > 0)
                    tempCurX--;
                else
                    tempCurX++;
            }
            //check if in bounds else revert changes
            if (tempCurZ < yTiles && tempCurX < xTiles)
            {
                curPos = curX * (yTiles - 1) + curZ;
                Tile curTile = gridTiles[curPos].GetComponent<Tile>();
                curTile.SetRiver();
                //gridTiles[curPos] set tile Type River
            }
        }
    }

    int findRandomEdgePos(int ranSeed)
    {
        int edgePos;
        if (ranSeed == 0)
        {
            // 0 upper Edge
            edgePos = (int)Random.Range(0, yTiles - 1);
        }
        else if (ranSeed == 1)
        {
            // 1 left Edge
            edgePos = (int)Random.Range(0, xTiles - 1) * (yTiles - 1);
        }
        else if (ranSeed == 2)
        {
            // 2 right Edge
            edgePos = (int)Random.Range(0, xTiles - 1) * (yTiles - 1) + (yTiles - 1);
        }
        else
        {
            // 3 lower Edge
            edgePos = (xTiles - 1) * (yTiles - 1) + (int)Random.Range(0, yTiles - 1);
        }
        return edgePos;
    }