diff --git a/Project.toml b/Project.toml
index cb6d577..11751d2 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,6 +7,7 @@ version = "1.1.2"
 ArchGDAL = "c9ce4bd3-c3d5-55b8-8973-c0e20141b8c3"
 DataDeps = "124859b0-ceae-595e-8997-d05f6a7a8dfe"
 GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
+HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [compat]
diff --git a/src/GADM.jl b/src/GADM.jl
index 283b4cb..4ae97cb 100644
--- a/src/GADM.jl
+++ b/src/GADM.jl
@@ -7,6 +7,7 @@ module GADM
 using DataDeps
 using ArchGDAL
 using Tables
+using HTTP
 
 import GeoInterface as GI
 
@@ -70,12 +71,20 @@ function download(country; version="4.1")
     catch
         # otherwise we register the data
         # and download using DataDeps.jl
-        register(DataDep(ID,
-            "Geographic data for country $country provided by the https://gadm.org project.",
-            "$route/$filename",
-            post_fetch_method=postfetch
-        ))
-        @datadep_str ID
+        try
+            register(DataDep(ID,
+                "Geographic data for country $country provided by the https://gadm.org project.",
+                "$route/$filename",
+                Any,
+                post_fetch_method=postfetch
+            ))
+            @datadep_str ID
+        catch e
+            if e isa HTTP.StatusError && e.status == 404
+                throw(ArgumentError("country code \"$country\" not found, please provide a standard ISO 3 country code"))
+            end
+            rethrow()
+        end
     end
 end
 
diff --git a/src/table.jl b/src/table.jl
index 0b1f94e..a4d7237 100644
--- a/src/table.jl
+++ b/src/table.jl
@@ -15,4 +15,5 @@ GI.isfeaturecollection(::Type{<:Table}) = true
 GI.trait(::Table) = GI.FeatureCollectionTrait()
 GI.nfeature(::GI.FeatureCollectionTrait, table::Table) = length(table.rows)
 GI.getfeature(::GI.FeatureCollectionTrait, table::Table, i) = table.rows[i]
+GI.geometrycolumns(::Table) = (:geom,)
 GI.crs(table::Table) = table.crs
diff --git a/test/GADM.jl b/test/GADM.jl
index 5a86db2..eb3da46 100644
--- a/test/GADM.jl
+++ b/test/GADM.jl
@@ -63,16 +63,20 @@ end
     # valid country code
     country = GADM.get("IND")
     @test Tables.istable(country)
-    @test GeoInterface.geomtrait(country.geom[1]) isa MultiPolygonTrait
+    @test Tables.rowaccess(country)
+    row = Tables.rows(country) |> first
+    @test GeoInterface.geomtrait(Tables.getcolumn(row, :geom)) isa MultiPolygonTrait
 
     # get country and states
     country, states = GADM.get("IND", depth=0), GADM.get("IND", depth=1)
     @test Tables.istable(country)
     @test Tables.istable(states)
-    @test GeoInterface.geomtrait(country.geom[1]) isa MultiPolygonTrait
-    @test length(states) == 12 # number of fields in table
-    geometries = Tables.getcolumn(states, Symbol("geom"))
-    @test length(geometries) == 41 # number of rows
+    row = Tables.rows(country) |> first
+    @test GeoInterface.geomtrait(Tables.getcolumn(row, :geom)) isa MultiPolygonTrait
+    rows = Tables.rows(states)
+    row = rows |> first
+    @test length(rows) == 41 # number of rows
+    @test length(Tables.columnnames(row)) == 12 # number of fields in table
 
     # throws error when query is invalid
     @test_throws ArgumentError GADM.get("IND", "Rio de Janeiro")
@@ -85,30 +89,31 @@ end
     level1 = GADM.get("IND", depth=1)
     level2 = GADM.get("IND", depth=2)
     level3 = GADM.get("IND", depth=3)
-    @test length(Tables.getcolumn(level0, :geom)) == 6
-    @test length(Tables.getcolumn(level1, :geom)) == 41
-    @test length(Tables.getcolumn(level2, :geom)) == 676
-    @test length(Tables.getcolumn(level3, :geom)) == 2347
+    @test length(Tables.rows(level0)) == 6
+    @test length(Tables.rows(level1)) == 41
+    @test length(Tables.rows(level2)) == 676
+    @test length(Tables.rows(level3)) == 2347
     
     somecities = ["Mumbai City", "Bangalore", "Chennai"]
-    @test issubset(somecities, level2.NAME_2)
+    level2cols = Tables.columns(level2)
+    @test issubset(somecities, Tables.getcolumn(level2cols, :NAME_2))
 
     # throws argument error when the level is deeper than available in dataset
     @test_throws ArgumentError GADM.get("IND", depth=4)
 
     # subregions tests
-    subregions = GADM.get("SUR", "Para", depth=1)
+    subregions = GADM.get("SUR", "Para", depth=1) |> Tables.columns
     expected = ["Bigi Poika", "Carolina", "Noord", "Oost", "Zuid"]
-    @test issetequal(subregions.NAME_2, expected)
+    @test issetequal(Tables.getcolumn(subregions, :NAME_2), expected)
 
     # subregions with same name
-    suriname = GADM.get("SUR", depth=2)
-    @test count(==("Welgelegen"), suriname.NAME_2) == 2
+    suriname = GADM.get("SUR", depth=2) |> Tables.columns
+    @test count(==("Welgelegen"), Tables.getcolumn(suriname, :NAME_2)) == 2
 
-    coronie = GADM.get("SUR", "Coronie", "Welgelegen")
-    paramaribo = GADM.get("SUR", "Paramaribo", "Welgelegen")
-    @test length(coronie.NAME_1) == length(paramaribo.NAME_1) == 1
-    @test coronie.NAME_1 ≠ paramaribo.NAME_1
+    coronie = GADM.get("SUR", "Coronie", "Welgelegen") |> Tables.columns
+    paramaribo = GADM.get("SUR", "Paramaribo", "Welgelegen") |> Tables.columns
+    @test length(Tables.getcolumn(coronie, :NAME_1)) == length(Tables.getcolumn(paramaribo, :NAME_1)) == 1
+    @test Tables.getcolumn(coronie, :NAME_1) ≠ Tables.getcolumn(paramaribo, :NAME_1)
 
     # invalid subregion
     @test_throws ArgumentError GADM.get("SUR", "a", "Welgelegen")
@@ -116,7 +121,8 @@ end
 
 @testset "basic" begin
     polygon = GADM.get("VAT")
-    bounds = ArchGDAL.envelope(polygon.geom[1])
+    row = Tables.rows(polygon) |> first
+    bounds = ArchGDAL.envelope(Tables.getcolumn(row, :geom))
     bounds_arr = [bounds.MinX, bounds.MaxX, bounds.MinY, bounds.MaxY]
 
     # Vatican City bounding boxes lat min 41.9002044 lat max 41.9073912 lon min 12.4457442 lon max 12.4583653