diff --git a/graph.cpp b/graph.cpp
index db9683ac..7bc86c2f 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -3031,6 +3031,53 @@ bool allemptynear(cell *c) {
 static const int trapcol[4] = {0x904040, 0xA02020, 0xD00000, 0x303030};
 static const int terracol[8] = {0xD000, 0xE25050, 0xD0D0D0, 0x606060, 0x303030, 0x181818, 0x0080, 0x8080};
                                
+// how much to darken
+int getfd(cell *c) {
+  switch(c->land) {
+    case laRedRock:
+    case laReptile:
+    case laCanvas: 
+      return 0;
+    
+    case laTerracotta:
+    case laMercuryRiver:
+      return c->wall == waMercury ? 0 : 1;
+
+    case laKraken:
+    case laBurial:
+    case laIvoryTower:
+    case laDungeon:
+    case laMountain:
+    case laEndorian:
+    case laCaribbean:
+    case laWhirlwind:
+    case laRose:
+    case laWarpSea:
+    case laTortoise:
+    case laDragon:
+    case laHalloween:
+    case laHunting:
+    case laOcean:
+    case laLivefjord:
+    case laWhirlpool:
+    case laAlchemist:
+    case laIce:
+    case laGraveyard:
+    case laBlizzard:
+    case laRlyeh:
+    case laTemple:
+    case laWineyard:
+    case laDeadCaves:
+    case laPalace:
+    case laCA:
+      return 1;
+    
+    case laTrollheim:
+    default:
+      return 2;
+    }    
+  }
+                               
 void drawcell(cell *c, transmatrix V, int spinv, bool mirrored) {
 
   qfi.shape = NULL; qfi.special = false;
@@ -3304,33 +3351,8 @@ void drawcell(cell *c, transmatrix V, int spinv, bool mirrored) {
     
     chasmg = chasmgraph(c);
     
-    int fd = 
-      c->land == laRedRock ? 0 : 
-      (c->land == laOcean || c->land == laLivefjord || c->land == laWhirlpool) ? 1 :
-      c->land == laAlchemist || c->land == laIce || c->land == laGraveyard || c->land == laBlizzard ||
-      c->land == laRlyeh || c->land == laTemple || c->land == laWineyard ||
-      c->land == laDeadCaves || c->land == laPalace || c->land == laCA ? 1 : 
-      c->land == laCanvas ? 0 :
-      c->land == laKraken ? 1 :
-      c->land == laBurial ? 1 :
-      c->land == laIvoryTower ? 1 :
-      c->land == laDungeon ? 1 :
-      c->land == laMountain ? 1 :
-      c->land == laEndorian ? 1 :
-      c->land == laCaribbean ? 1 :
-      c->land == laWhirlwind ? 1 :
-      c->land == laRose ? 1 :
-      c->land == laWarpSea ? 1 :
-      c->land == laTortoise ? 1 :
-      c->land == laDragon ? 1 :
-      c->land == laHalloween ? 1 :
-      c->land == laTrollheim ? 2 :
-      c->land == laReptile ? 0 :
-      c->land == laHunting ? 1 :
-      c->land == laTerracotta ? 1 :
-      c->land == laMercuryRiver ? 0 :
-      2;
-    
+    int fd = getfd(c);
+                     
     if(c->wall == waMagma) fd = 0;
     
     poly_outline = OUTLINE_DEFAULT;
@@ -3726,8 +3748,35 @@ void drawcell(cell *c, transmatrix V, int spinv, bool mirrored) {
       else if(c->land == laRedRock)
         qfloor(c, Vf, eoh ? shFloor[ct6] : shDesertFloor[ct6], darkena(fcol, fd, 0xFF));
 
-      else if(c->land == laPalace || c->land == laTerracotta || c->land == laMercuryRiver)
+      else if(c->land == laPalace || c->land == laTerracotta)
         qfloor(c, Vf, (eoh?shFloor:shPalaceFloor)[ct6], darkena(fcol, fd, 0xFF));
+      
+      else if(c->land == laMercuryRiver) {
+        if(eoh)
+          qfloor(c, Vf, shFloor[ct6], darkena(fcol, fd, 0xFF));
+        else {
+          int bridgedir = -1;
+          if(c->type == 6) {
+            for(int i=1; i<c->type; i+=2)
+              if(pseudohept(c->mov[(i+5)%6]) && c->mov[(i+5)%6]->land == laMercuryRiver)
+              if(pseudohept(c->mov[(i+1)%6]) && c->mov[(i+1)%6]->land == laMercuryRiver)
+                bridgedir = i;
+            }
+          if(bridgedir == -1)
+            qfloor(c, Vf, (eoh?shFloor:shPalaceFloor)[ct6], darkena(fcol, fd, 0xFF));
+          else {
+            transmatrix bspin = ddspin(c, bridgedir);
+            qfloor(c, Vf, bspin, shMercuryBridge[0], darkena(fcol, fd, 0xFF));
+            // only needed in one direction
+            if(c < c->mov[bridgedir]) {
+              bspin = Vf * bspin;
+              queuepoly(bspin, shMercuryBridge[1], darkena(fcol, fd+1, 0xFF));
+              queuepolyat(mscale(bspin, geom3::LAKE), shMercuryBridge[1], darkena(gradient(0, winf[waMercury].color, 0, 0.8,1), 0, 0x80), PPR_LAKELEV);
+              queuepolyat(mscale(bspin, geom3::BOTTOM), shMercuryBridge[1], darkena(0x202020, 0, 0xFF), PPR_LAKEBOTTOM);
+              }
+            }
+          }
+        }
 
       else {
         qfloor(c, Vf, shFloor[ct6], darkena(fcol, fd, 0xFF));
diff --git a/landgen.cpp b/landgen.cpp
index b9011048..665b75fd 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -821,6 +821,13 @@ void giantLandSwitch(cell *c, int d, cell *from) {
             c->landparam--;
           }
         }
+      if(d == 7) {
+        int nearriver = 0;
+        forCellEx(c2, c) 
+          if(c2->wall == waMercury && pseudohept(c2)) 
+            nearriver++;
+        if(nearriver == 2) c->land = laMercuryRiver;
+        }
       ONEMPTY {
         bool nearwarrior = false;
         forCellEx(c2, c) if(c2->wall == waTerraWarrior) nearwarrior = true;
diff --git a/polygons.cpp b/polygons.cpp
index 87e5c98e..7b4cdf81 100644
--- a/polygons.cpp
+++ b/polygons.cpp
@@ -642,6 +642,7 @@ hpcshape
   shSemiFloor[2], shSemiBFloor[2], shSemiFloorShadow,
   shDesertFloor[2], shRedRockFloor[3][2],
   shPalaceFloor[2], shNewFloor[2], shTrollFloor[2],
+  shMercuryBridge[2],
   shLeafFloor[2],
   shBarrowFloor[3],
   shTriheptaFloor[11], shTriheptaFloor2[2], shTriheptaEuc[3],
@@ -1359,6 +1360,10 @@ void buildpolys() {
   bshape(shTriheptaEucShadow[2], PPR_FLOOR,  scalef*SHADMUL, 44);
   bshape(shPalaceFloor[0], PPR_FLOOR,  scalef*spzoom6, 45);
   bshape(shPalaceFloor[1], PPR_FLOOR,  scalef*spzoomd7, 46);
+
+  bshape(shMercuryBridge[0], PPR_FLOOR,  scalef*spzoom6, 365);
+  bshape(shMercuryBridge[1], PPR_FLOOR,  scalef*spzoomd7, 366);
+  
   bshape(shPalaceGate, PPR_STRUCT1, scalef, 47);
   bshape(shSemiFeatherFloor[0], PPR_FLOOR,  scalef*spzoom6, 48);
   bshape(shSemiFeatherFloor[1], PPR_FLOOR,  scalef*spzoom6, 49);
@@ -2851,6 +2856,10 @@ NEWSHAPE, 362, 1, 1, -0.098710,-0.040954, -0.120861,-0.011561, -0.169793,0.00105
 
 NEWSHAPE, 363, 1, 2, -0.252495,0.014545, -0.330447,0.029660, -0.319594,0.016402, -0.419249,0.040217, -0.457189,-0.013336, 
 NEWSHAPE, 364, 1, 2, -0.486619,0.002830, -0.418060,0.040577, -0.427473,0.022591, -0.408958,0.019603, -0.426031,0.010325, -0.407739,0.001037, 
+
+NEWSHAPE, 365, 1, 2, -0.236444,-0.000864, -0.300824,-0.142089, 0.027603,-0.331178, 0.117026,-0.205327, 
+NEWSHAPE, 366, 1, 2, 0.120242,0.202432, 0.476077,0.202192,
+
 NEWSHAPE
 };