diff --git a/tests/orog/CMakeLists.txt b/tests/orog/CMakeLists.txt
index 6b709dce8..4fe257e9e 100644
--- a/tests/orog/CMakeLists.txt
+++ b/tests/orog/CMakeLists.txt
@@ -8,7 +8,12 @@ elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
 endif()
 
-#include_directories(${PROJECT_SOURCE_DIR})
+# Copy necessary test files from the source data directory to the
+# build data directory.
+
+# Note, the "read_global_mask" routine expects the filename "landcover.umd.30s.nc".
+execute_process( COMMAND ${CMAKE_COMMAND} -E copy
+    ${CMAKE_CURRENT_SOURCE_DIR}/data/landcover.umd.lowres.nc ${CMAKE_CURRENT_BINARY_DIR}/landcover.umd.30s.nc)
 
 add_executable(ftst_ll2xyz ftst_ll2xyz.F90)
 add_test(NAME orog-ftst_ll2xyz COMMAND ftst_ll2xyz)
@@ -57,3 +62,7 @@ target_link_libraries(ftst_get_xnsum3 orog_lib)
 add_executable(ftst_rm_isolated_pts ftst_rm_isolated_pts.F90)
 add_test(NAME orog-ftst_rm_isolated_pts COMMAND ftst_rm_isolated_pts)
 target_link_libraries(ftst_rm_isolated_pts orog_lib)
+
+add_executable(ftst_read_global_mask ftst_read_global_mask.F90)
+add_test(NAME orog-ftst_read_global_mask COMMAND ftst_read_global_mask)
+target_link_libraries(ftst_read_global_mask orog_lib)
diff --git a/tests/orog/data/landcover.umd.lowres.nc b/tests/orog/data/landcover.umd.lowres.nc
new file mode 100644
index 000000000..5652f438f
Binary files /dev/null and b/tests/orog/data/landcover.umd.lowres.nc differ
diff --git a/tests/orog/ftst_read_global_mask.F90 b/tests/orog/ftst_read_global_mask.F90
new file mode 100644
index 000000000..9a4a67229
--- /dev/null
+++ b/tests/orog/ftst_read_global_mask.F90
@@ -0,0 +1,36 @@
+ program read_gbl_mask
+
+! Test routine "read_global_mask" using a reduced-size
+! version (6 x 3 vs 43200 x 21600) of the umd land mask file. 
+
+ use io_utils, only : read_global_mask
+
+ implicit none
+
+ integer, parameter :: im=6
+ integer, parameter :: jm=3
+
+ integer            :: i, j
+
+ integer(kind=1)    :: mask(im,jm)
+ integer(kind=1)    :: mask_expected(im,jm)
+
+! Note the routine flips the i and j directions.
+ data mask_expected /1,1,1,0,0,1, &
+                     1,1,1,0,0,0, &
+                     1,1,1,0,0,0/
+
+ print*,"- Begin test of read_global_mask"
+
+ call read_global_mask(im, jm, mask)
+
+ do j = 1, jm
+ do i = 1, im
+   if (mask(i,j) /= mask_expected(i,j)) stop 3
+ enddo
+ enddo
+
+ print*,"OK"
+ print*,"SUCCSSS"
+
+ end program read_gbl_mask